摘要：38．先化简.再求值.其中． 解:原式················································································· 4分 ························································································································· 6分 当时.原式．································································································· 7分
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出租车由西向东匀速行驶，测得此车从A处行驶到B处所用的时间为4秒且∠APO=60°，∠BPO=45°．